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        <p><div style="color:Chocolate;text-align:center;display:inline-block;width:100%;">
  回顾每一天的知识盲点
</div><br><span id="more"></span></p>
<h2 id="emacs-中添加-vue-mode-模式"><a href="#emacs-中添加-vue-mode-模式" class="headerlink" title="emacs 中添加 vue-mode 模式"></a>emacs 中添加 vue-mode 模式</h2><p>在<code>~/.doom.d/package.el</code>文件中添加<code>vue-mode</code>的包的引入.</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">(package! vue-mode</span><br><span class="line">  :recipe (:host github :repo "AdamNiederer/vue-mode"))</span><br></pre></td></tr></table></figure>
<h2 id="java-中，ParallelStream-和-Stream-的区别？"><a href="#java-中，ParallelStream-和-Stream-的区别？" class="headerlink" title="java 中，ParallelStream()和 Stream()的区别？"></a>java 中，ParallelStream()和 Stream()的区别？</h2><p>ParallelStream()是使用多线程去并发遍历，而 stream()是单线程。</p>
<p><strong>当循环遍历中不需要进行数据库操作时，使用 stream()或普通循环来遍历(根据实际业务情况来选择用哪个)。</strong><br><strong>当循环遍历中(多次循环，百次以上)需要进行数据库操作时，使用 ParallelStream()来遍历，但是要注意多线程安全。</strong></p>
<h2 id="easypoi-的-excel-文件导入时，进行字段校验"><a href="#easypoi-的-excel-文件导入时，进行字段校验" class="headerlink" title="easypoi 的 excel 文件导入时，进行字段校验"></a>easypoi 的 excel 文件导入时，进行字段校验</h2><p>校验是一个不可或缺的功能，现在 java 校验主要的是 JSR303 规范，实现方式主流的有二种：</p>
<pre><code>1. Hibernate Validator
2. Apache Commons Validator
</code></pre><h3 id="使用"><a href="#使用" class="headerlink" title="使用"></a>使用</h3><p>对象</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * Email校验</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Excel(name = "Email", width = 25)</span></span><br><span class="line"><span class="keyword">private</span> String email;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 最大</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Excel(name = "Max")</span></span><br><span class="line"><span class="meta">@Max(value = 15,message = "max 最大值不能超过15" ,groups = {ViliGroupOne.class})</span></span><br><span class="line"><span class="keyword">private</span> <span class="type">int</span>    max;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 最小</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Excel(name = "Min")</span></span><br><span class="line"><span class="meta">@Min(value = 3, groups = {ViliGroupTwo.class})</span></span><br><span class="line"><span class="keyword">private</span> <span class="type">int</span>    min;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 非空校验</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Excel(name = "NotNull")</span></span><br><span class="line"><span class="meta">@NotNull</span></span><br><span class="line"><span class="keyword">private</span> String notNull;</span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * 正则校验</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="meta">@Excel(name = "Regex")</span></span><br><span class="line"><span class="meta">@Pattern(regexp = "[\u4E00-\u9FA5]*", message = "不是中文")</span></span><br><span class="line"><span class="keyword">private</span> String regex;</span><br></pre></td></tr></table></figure>
<p>使用方式</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Test</span></span><br><span class="line">  <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">basetest</span><span class="params">()</span> {</span><br><span class="line">      <span class="keyword">try</span> {</span><br><span class="line">          <span class="type">ImportParams</span> <span class="variable">params</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">ImportParams</span>();</span><br><span class="line">          params.setNeedVerfiy(<span class="literal">true</span>);</span><br><span class="line">          params.setVerfiyGroup(<span class="keyword">new</span> <span class="title class_">Class</span>[]{ViliGroupOne.class});</span><br><span class="line">          ExcelImportResult&lt;ExcelVerifyEntity&gt; result = ExcelImportUtil.importExcelMore(</span><br><span class="line">              <span class="keyword">new</span> <span class="title class_">File</span>(PoiPublicUtil.getWebRootPath(<span class="string">"import/verfiy.xlsx"</span>)),</span><br><span class="line">              ExcelVerifyEntity.class, params);</span><br><span class="line">          <span class="type">FileOutputStream</span> <span class="variable">fos</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">FileOutputStream</span>(<span class="string">"D:/excel/ExcelVerifyTest.basetest.xlsx"</span>);</span><br><span class="line">          result.getWorkbook().write(fos);</span><br><span class="line">          fos.close();</span><br><span class="line">          <span class="keyword">for</span> (<span class="type">int</span> <span class="variable">i</span> <span class="operator">=</span> <span class="number">0</span>; i &lt; result.getList().size(); i++) {</span><br><span class="line">              System.out.println(ReflectionToStringBuilder.toString(result.getList().get(i)));</span><br><span class="line">          }</span><br><span class="line">          Assert.assertTrue(result.getList().size() == <span class="number">1</span>);</span><br><span class="line">          Assert.assertTrue(result.isVerfiyFail());</span><br><span class="line">      } <span class="keyword">catch</span> (Exception e) {</span><br><span class="line">          LOGGER.error(e.getMessage(),e);</span><br><span class="line">      }</span><br><span class="line">  }</span><br></pre></td></tr></table></figure>
<p>IExcelModel, 需要对象实现这个接口，来返回导入失败的错误信息。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">ExcelVerifyEntityOfMode</span> <span class="keyword">implements</span> <span class="title class_">IExcelModel</span> {</span><br><span class="line"></span><br><span class="line">  <span class="keyword">private</span> String errorMsg;</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> String <span class="title function_">getErrorMsg</span><span class="params">()</span> {</span><br><span class="line">      <span class="keyword">return</span> errorMsg;</span><br><span class="line">  }</span><br><span class="line"></span><br><span class="line">  <span class="meta">@Override</span></span><br><span class="line">  <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">setErrorMsg</span><span class="params">(String errorMsg)</span> {</span><br><span class="line">      <span class="built_in">this</span>.errorMsg = errorMsg;</span><br><span class="line">  }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>IExcelDataModel,需要对象实现这个接口,来获取错误数据的行号。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">interface</span> <span class="title class_">IExcelDataModel</span> {</span><br><span class="line"></span><br><span class="line">  <span class="comment">/**</span></span><br><span class="line"><span class="comment">   * 获取行号</span></span><br><span class="line"><span class="comment">   * <span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">   */</span></span><br><span class="line">  <span class="keyword">public</span> <span class="type">int</span> <span class="title function_">getRowNum</span><span class="params">()</span>;</span><br><span class="line"></span><br><span class="line">  <span class="comment">/**</span></span><br><span class="line"><span class="comment">   *  设置行号</span></span><br><span class="line"><span class="comment">   * <span class="doctag">@param</span> rowNum</span></span><br><span class="line"><span class="comment">   */</span></span><br><span class="line">  <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">setRowNum</span><span class="params">(<span class="type">int</span> rowNum)</span>;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>IExcelVerifyHandler,使用此接口自定义自己的校验规则，比如唯一性校验，等等。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">public</span> <span class="keyword">interface</span> <span class="title class_">IExcelVerifyHandler</span>&lt;T&gt; {</span><br><span class="line">  <span class="comment">/**</span></span><br><span class="line"><span class="comment">   * 导入校验方法</span></span><br><span class="line"><span class="comment">   *</span></span><br><span class="line"><span class="comment">   * <span class="doctag">@param</span> obj</span></span><br><span class="line"><span class="comment">   *            当前对象</span></span><br><span class="line"><span class="comment">   * <span class="doctag">@return</span></span></span><br><span class="line"><span class="comment">   */</span></span><br><span class="line">  <span class="keyword">public</span> ExcelVerifyHanlderResult <span class="title function_">verifyHandler</span><span class="params">(T obj)</span>;</span><br></pre></td></tr></table></figure>
<h2 id="多数据源，实现事务的一致性"><a href="#多数据源，实现事务的一致性" class="headerlink" title="多数据源，实现事务的一致性"></a>多数据源，实现事务的一致性</h2><h3 id="JTA-的方式实现"><a href="#JTA-的方式实现" class="headerlink" title="JTA 的方式实现"></a>JTA 的方式实现</h3><ul>
<li><p>什么是 JTA</p>
<p>java 事务 API(Java Transaction API,简称 JTA)，是一个 Java 企业版的应用程序。不过 JTA 只是提供了一个接口，并没有提供具体的实现。</p>
</li>
<li><p>常见的 JTA 实现</p>
<ol>
<li>J2EE 容器所提供的 JTA 实现(JBoss)</li>
<li>独立的 JTA 实现：如 JOTM, Atomikos</li>
</ol>
</li>
<li><p>网上的一个实现 demo</p>
</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br><span class="line">95</span><br><span class="line">96</span><br><span class="line">97</span><br><span class="line">98</span><br><span class="line">99</span><br><span class="line">100</span><br><span class="line">101</span><br><span class="line">102</span><br><span class="line">103</span><br><span class="line">104</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> java.util.HashMap;</span><br><span class="line"><span class="keyword">import</span> java.util.Map;</span><br><span class="line"><span class="keyword">import</span> java.util.Stack;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.AfterReturning;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.AfterThrowing;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Aspect;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Before;</span><br><span class="line"><span class="keyword">import</span> org.aspectj.lang.annotation.Pointcut;</span><br><span class="line"><span class="keyword">import</span> org.springframework.beans.factory.annotation.Autowired;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.ApplicationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.jdbc.datasource.DataSourceTransactionManager;</span><br><span class="line"><span class="keyword">import</span> org.springframework.stereotype.Component;</span><br><span class="line"><span class="keyword">import</span> org.springframework.transaction.TransactionDefinition;</span><br><span class="line"><span class="keyword">import</span> org.springframework.transaction.TransactionStatus;</span><br><span class="line"><span class="keyword">import</span> org.springframework.transaction.support.DefaultTransactionDefinition;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">* 多数据源事务切面</span></span><br><span class="line"><span class="comment">* ※采用Around似乎不行※</span></span><br><span class="line"><span class="comment">*</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="meta">@Component</span></span><br><span class="line"><span class="meta">@Aspect</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">MultiTransactionAop</span> {</span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 线程本地变量：为什么使用栈？※为了达到后进先出的效果※</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="keyword">private</span> <span class="keyword">static</span> <span class="keyword">final</span> ThreadLocal&lt;Stack&lt;Map&lt;DataSourceTransactionManager, TransactionStatus&gt;&gt;&gt; THREAD_LOCAL = <span class="keyword">new</span> <span class="title class_">ThreadLocal</span>&lt;&gt;();</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 用于获取事务管理器</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="meta">@Autowired</span></span><br><span class="line">    <span class="keyword">private</span> ApplicationContext applicationContext;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 事务声明</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="keyword">private</span> <span class="type">DefaultTransactionDefinition</span> <span class="variable">def</span> <span class="operator">=</span> <span class="keyword">new</span> <span class="title class_">DefaultTransactionDefinition</span>();</span><br><span class="line">    {</span><br><span class="line">        <span class="comment">// 非只读模式</span></span><br><span class="line">        def.setReadOnly(<span class="literal">false</span>);</span><br><span class="line">        <span class="comment">// 事务隔离级别：采用数据库的</span></span><br><span class="line">        def.setIsolationLevel(TransactionDefinition.ISOLATION_DEFAULT);</span><br><span class="line">        <span class="comment">// 事务传播行为</span></span><br><span class="line">        def.setPropagationBehavior(TransactionDefinition.PROPAGATION_REQUIRED);</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 切点</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="meta">@Pointcut("@annotation(MultiTransactional注解路径)")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">pointcut</span><span class="params">()</span> {</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 声明事务</span></span><br><span class="line"><span class="comment">    *</span></span><br><span class="line"><span class="comment">    * <span class="doctag">@param</span> transactional 注解</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="meta">@Before("pointcut() &amp;&amp; @annotation(transactional)")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">before</span><span class="params">(MultiDataSourceTransactional transactional)</span> {</span><br><span class="line">        <span class="comment">// 根据设置的事务名称按顺序声明，并放到ThreadLocal里</span></span><br><span class="line">        String[] transactionManagerNames = transactional.transactionManagers();</span><br><span class="line">        Stack&lt;Map&lt;DataSourceTransactionManager, TransactionStatus&gt;&gt; pairStack = <span class="keyword">new</span> <span class="title class_">Stack</span>&lt;&gt;();</span><br><span class="line">        <span class="keyword">for</span> (String transactionManagerName : transactionManagerNames) {</span><br><span class="line">            <span class="type">DataSourceTransactionManager</span> <span class="variable">transactionManager</span> <span class="operator">=</span> applicationContext.getBean(transactionManagerName, DataSourceTransactionManager.class);</span><br><span class="line">            <span class="type">TransactionStatus</span> <span class="variable">transactionStatus</span> <span class="operator">=</span> transactionManager.getTransaction(def);</span><br><span class="line">            Map&lt;DataSourceTransactionManager, TransactionStatus&gt; transactionMap = <span class="keyword">new</span> <span class="title class_">HashMap</span>&lt;&gt;();</span><br><span class="line">            transactionMap.put(transactionManager, transactionStatus);</span><br><span class="line">            pairStack.push(transactionMap);</span><br><span class="line">        }</span><br><span class="line">        THREAD_LOCAL.set(pairStack);</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 提交事务</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="meta">@AfterReturning("pointcut()")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">afterReturning</span><span class="params">()</span> {</span><br><span class="line">        <span class="comment">// ※栈顶弹出（后进先出）</span></span><br><span class="line">        Stack&lt;Map&lt;DataSourceTransactionManager, TransactionStatus&gt;&gt; pairStack = THREAD_LOCAL.get();</span><br><span class="line">        <span class="keyword">while</span> (!pairStack.empty()) {</span><br><span class="line">            Map&lt;DataSourceTransactionManager, TransactionStatus&gt; pair = pairStack.pop();</span><br><span class="line">            pair.forEach((key,value)-&gt;key.commit(value));</span><br><span class="line">        }</span><br><span class="line">        THREAD_LOCAL.remove();</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">    <span class="comment">/**</span></span><br><span class="line"><span class="comment">    * 回滚事务</span></span><br><span class="line"><span class="comment">    */</span></span><br><span class="line">    <span class="meta">@AfterThrowing(value = "pointcut()")</span></span><br><span class="line">    <span class="keyword">public</span> <span class="keyword">void</span> <span class="title function_">afterThrowing</span><span class="params">()</span> {</span><br><span class="line">        <span class="comment">// ※栈顶弹出（后进先出）</span></span><br><span class="line">        Stack&lt;Map&lt;DataSourceTransactionManager, TransactionStatus&gt;&gt; pairStack = THREAD_LOCAL.get();</span><br><span class="line">        <span class="keyword">while</span> (!pairStack.empty()) {</span><br><span class="line">            Map&lt;DataSourceTransactionManager, TransactionStatus&gt; pair = pairStack.pop();</span><br><span class="line">            pair.forEach((key,value)-&gt;key.rollback(value));</span><br><span class="line">        }</span><br><span class="line">        THREAD_LOCAL.remove();</span><br><span class="line">    }</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><a target="_blank" rel="noopener" href="https://blog.csdn.net/mibi8840/article/details/106357508">代码参考链接</a></p>
<h3 id="分布式事务实现"><a href="#分布式事务实现" class="headerlink" title="分布式事务实现"></a>分布式事务实现</h3><h3 id="多数据源切换"><a href="#多数据源切换" class="headerlink" title="多数据源切换"></a>多数据源切换</h3><figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">import</span> org.springframework.jdbc.datasource.lookup.AbstractRoutingDataSource;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment">* 多数据源</span></span><br><span class="line"><span class="comment">*</span></span><br><span class="line"><span class="comment">*/</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">DynamicDataSource</span> <span class="keyword">extends</span> <span class="title class_">AbstractRoutingDataSource</span> {</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Override</span></span><br><span class="line">    <span class="keyword">protected</span> Object <span class="title function_">determineCurrentLookupKey</span><span class="params">()</span> {</span><br><span class="line">        <span class="keyword">return</span> DynamicContextHolder.peek();</span><br><span class="line">    }</span><br><span class="line"></span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p><strong>determineCurrentLookupKey () 是 AbstractRoutingDataSource 类中的一个抽象方法，而它的返回值是当前线程要用的数据源 dataSource 的 key 值，有了这个 key 值，resolvedDataSource（这是个 map,由配置文件中设置好后存入的）就从中取出对应的 DataSource，如果找不到，就用配置默认的数据源。</strong></p>
<h3 id="注解-ConfigurationProperties"><a href="#注解-ConfigurationProperties" class="headerlink" title="注解@ConfigurationProperties"></a>注解<code>@ConfigurationProperties</code></h3><ol>
<li>首先先在配置文件中配置所需的值</li>
</ol>
<figure class="highlight yaml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment"># demo</span></span><br><span class="line"><span class="string">demo.hello=123</span></span><br><span class="line"><span class="string">demo.world=888</span></span><br></pre></td></tr></table></figure>
<ol>
<li>声明一个实体配置注解</li>
</ol>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@ConfigurationProperties(prefix = "demo")</span></span><br><span class="line"><span class="keyword">public</span> <span class="keyword">class</span> <span class="title class_">DynamicDataSourceProperties</span> {</span><br><span class="line">  <span class="keyword">private</span> String hello;</span><br><span class="line">  <span class="keyword">private</span> String world;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>

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